Question

8 what are glaciers known to leave behind on rocks they move over? a volcanic ash b sediment layers c glacial striations d erosion marks

Explanation:

Volcanic ash comes from volcanic eruptions, not glaciers. Sediment layers are generally deposited by water or wind over time, not directly left by glacial movement on rocks. Erosion marks is a broad, non-specific term, while glacial striations are the distinct, linear scratches that glaciers (carrying rock fragments) leave on the surface of rocks they move over, which is a specific, well-documented feature of glacial activity.

Answer:

C. Glacial striations